Low-pressure mercury vapor discharge lamp having determined probability of failure
AssigneeKoninklijke Philips Electronics N.V.
InventorHerman Johannes Gertrudis Gielen
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Abstract
Low-pressure mercury vapor discharge lamp has a discharge vessel (10) enclosing, in a gastight manner, a discharge space (13) provided with a filling of mercury and an inert gas in a gastight manner. The discharge vessel comprising electrodes (20a; 20b) arranged in the discharge space for maintaining a discharge in the discharge space. According to the invention, the probability of failure of the low-pressure mercury vapor discharge lamp being substantially determined by one of the electrodes. As upon igniting the low-pressure mercury vapor discharge lamp the ignition-related events influence the electrodes, preferably, the ignition-related events substantially are prevented affecting the one electrode.
Claims11
A low-pressure mercury-vapor discharge lamp comprising:
- a discharge vessel enclosing, in a gastight manner, a discharge space provided with a filling of mercury and an inert gas in a gastight manner, and
- electrodes arranged in the discharge space for maintaining a discharge in the discharge space, wherein the probability of failure of the low-pressure mercury vapor discharge lamp being substantially determined by one of the electrodes, further wherein the electrodes are provided with an emitter material for supplying electrons to the discharge, the mass of the emitter material of the one electrode being 20% lower than the average mass of the emitter material of the electrodes.
A low-pressure mercury vapor discharge lamp comprising:
- a discharge vessel enclosing, in a gastight manner, a discharge space provided with the filling of mercury and an inert gas in a gastight manner, and
- electrodes arranged in the discharge space for maintaining a discharge in the discharge space, wherein the probability of failure of the low-pressure mercury vapor discharge lamp being substantially determined by one of the electrodes, further wherein the electrodes are provided with an emitter material for supplying electrons to the discharge, the content of barium, calcium and/or strontium in the emitter material of the one electrode being 20% lower than the average barium, calcium or strontium content in the emitter material of the electrodes, respectively.
A low-pressure mercury vapor discharge lamp comprising:
- a discharge vessel enclosing, in a gastight manner, a discharge space provided with the filling of mercury and an inert gas in a gastight manner, and
- electrodes arranged in the discharge space for maintaining a discharge in the discharge space, wherein the probability of failure of the low-pressure mercury vapor discharge lamp being substantially determined by one of the electrodes, further wherein the one electrode is surrounded by an electrode ring, the electrode ring functioning as a cage of Faraday.
Dependencies are inferred from the claim text.